Abrasive wheel



INVENTOR. @MJ/aw Wa# A. W. MALL ABRASIVE WHEEL Filed oct. 2e, i956 @n/zw MTORNEY.

torted by centrifugal motion arid in fact has a. or deflation. An air valve 34 communicating with 25 30 flation or deflation and also capable of easy re- The tire member is formed with a plurality of 30 40 pneumatic backing in the form of a cylindrical strip 42 which isadapted to be sized with ghie and 40 Patented May 3,1938 2,116,272

' UNITED STATES PATENT OFFICE v am'islva WHEEL Arthur william Mau, chicago, m.

Application October 26, 1936, Serial No. 107,612

4 Claims. (Cl. 51-192) My invention relates to improvements in Fig.` 4 is asimilar fragmentary View of a modiabrasive wheels, sanding drums and like devices; fled form of my improved device.

My invention relates more particularly to im- In the embodiment or my invention which I provements in devices of the type mentioned have chosen to illustrate, I provide a driven shaft 5 whereby more 'effective polishing and sanding I0 having a reduced portion I2 and a screwmay be done, particularly on objects which are threaded portion I4. Ahub member I5 is mountof irregular configuration. ed on the reduced portion I2 of the drive shaft I0 In the past, drum sanders, buffers and polish- 'v and held in place by the nut 26. This member ing devices have been provided with a somewhat has a peripheral flange l3` formed thereon to l flexible grinding or Lpolishing surface. These provide means for fastening the mounting plates 10 have usually been provided with a flattened rublli and |8- The mounting plates I6 and I8 are ber bag or core capable of' receiving a small generally similar to disc Wheel members and are amount of airto inflate the same slightly and provided with a cylindrical band portion 20 thus provide some degree of flexibility to 'the formed with e plurality 0f transverse, radially l sanding, bufng or polishing surface. f spaced arcuate grooves 22. The backing plates 1'5 The principal objectof my invention is to pro- Y have offset portions 24 capable of beine positioned vide an improved sanding, bufing or polishing" over the flange I3 of the hub portion and adapted drum having a pneumatic backing or mounting t0 be held in Plee as ShOWn by a plurality 0f bQlt for the abrasive band so that the same is capable members 25. The backing plates are adapted t0 of flexing during use. n engage and confine between the band portions A further object of my inventionis to provide 20 thereof, al pneumatic tire member 36. The

an improved pneumatic backing for an abrasive tire member may be Of vthe usual fabric, 00rd drum in the form of a cylindrical tire member. and rubber construction and may contain an in- With a backing of this type; the drum is not disner cylindrical chamber 32 capable of inflation tendency to revolve more smoothly than'any of chamber 32, passes through an opening 33 in the devices of the prior art..;, f plate I 6 andprovides for connection with a suit- A further object is to fprovidefai improved able bicycle pump or'other means for inflating pneumatic backing member capable of easy in- Vthe same. f

moval or assembly on a driving spindle. transverse and radially spaced semi-cylindrical A further object is to provide an improved, ridge portions 36 complementary to and adapted abrasive wheel construction whereby all of the to engage in the grooves 22 of the backing plates. parts are capable of being easily dissembled' by In this manner the tire is securely mounted on simply permitting the air to escape from the the backing plates and will revolve with the same. 35

backing member and easily assembled by plac- The tire is built up as shown at 38 toprovide ing all of the parts in their proper position and a at cylindrical Wall portion 46 upon which an then infleting Said backing member. y 'abrasive band is adapted to be mounted. In the V A further Object iS t0 DIOVlde an lmDrQVed usual construction I provide a canvas backing tire member having a surface configuration of emery and then haven, comparatively thin abraany "iSired Shallesive band 4B mountedthereon. It will be noted Other ObjeCtS and advantages Will be more apthat the flat peripheral surface ll vis amply supparent from the following description wherein portedfrom edge to edge, the tire being built up reference is had t0 the aeCOmpanying Sheet 0f f as shown at 46 to provide rigid support adjacent 45 drawings upon which: the edges. Y

Fig. l is a front elevational view of my im- To assemble the abrasive Wheel upon the shaft proved abrasive wheel with the front tire sup- I0 it is onlynecessary to mount the time memport removed and the shaft and hub shown in bei' as described between the backing plates I6 50 section; and I6, place the backing strip and adhesive' Fig. 2 is a vertical section view taken generally band upon the cylindrical surface 40, and inon the lines 2 2 of Fig. 1; ate thetire `with the desired number of pounds Fig. 3 is a fragmentary sectional view uon an of' air. After this has been done and the nut enlarged scale: and` member 26 mounted upm the threaded portion and is ready for use.

From the foregoing description it can be seen that a comparatively simple abrasive wheel has been provided, one that will be extremely effective in polishing or sanding objects with irregular configurations. The grinding surface may be rendered as flexible as desired, depending entirely upon the amount of air pressure provided in the tire member.

The removal or replacement of abrasive bands is rendered exceedingly simple, due to the fact that the air may be permitted to escape from the tire member, whereby the same can be flexed as desired to effect the removal and replacement of new abrasive bands.

In Fig. 4 I have illustrated a modified form of my invention, wherein I provide a concave exte- 'rior surface 40a to the tire member 30. In this construction I also provide a concavely shaped backing member 42a and a similar abrasive band 44a, adhesively secured to-the face of the backing. Due to the built-up portions 46a, the abrasive wheel rigidly retains the shape shown when driven at high speed. This is due to the fact that the cylindrical chamber is charged with air under pressure and this chamber supports the working surface.

From the foregoing it will be obvious that any desired face configuration may be rigidly sup.

ported by a tire member of the kind I provide. I contemplate that convex, arcuate, irregular or sharp cornered surfaces of any kind may be provided, depending entirely upon the purpose for which the wheel is employed. I

While I have'illustrated and described a preferred embodiment of my invention, and a modication thereof, it will be apparent to those skilled in the art that changes and modifications may be made in the exact details shown, and I do not wish to be limited in any particular; rather what I desire to secure and protect by Letters Patent of the United States is:

1. An abrasive Wheel of the class described, comprising a shaft, a pair of similarly shaped mounting plates secured together and on said shaft, each of said plates having a disc portion and a right angle ange portion, a plurality of transverse, radially disposed grooves in said` flange portions and a pneumatic tire mounted on the iiange portions of said plates, said tire having its inner periphery formed with transverse I4 of the shaft, the abrasive wheel is assembled radially disposed lugr portions complementary to and engaging in the grooves in said ange portions.

2. An abrasive wheel of the -class described, comprising a shaft, a pair of similarly shaped mounting plates secured together and on said shaft, each of said plates having a disc portion and a right aiagle flange portion, a plurality of transverse, radially disposed grooves in said flange portions and a pneumatic tire mounted on the ange portions of said plates, said tire having its inner periphery formed with transverse radially disposed lug portions complementary to and engaging in the grooves in said flange portions, said tire having a at cylindrical surface on the outer edge thereof, a backing member in the form of a ring mounted thereon, and an abrasive band held to said backing member.

3. An abrasive wheel of the class described, comprising a shaft, apair of similarly shaped mounting plates secured together and on said shaft, each of said plates having a disc portion and a right angle flange portion, a plurality of transverse, radially disposed grooves in said flange portions and a pneumatic' tire mounted on the flange portions of said plates, said tire having its inner periphery formed with transverse radially disposed lug portions complementary to and engaging in the grooves in said flange portions,said tire having a flat cylindrical 'surface on the outer edge thereof, a backing member in the form of a .ring mounted thereon, an abrasive band held to said backing member, and an air valve associated with said pneumatic tire.

4. An abrasive wheel of the class described, I

comprising a shaft, a pairof similarly shaped mounting plates secured together and on said shaft, each of said plates having a disc portion anda right angle flange portion, a'plurality of transverse, radially disposed grooves in said flange portions and a pneumatic tire mounted on the flange-portions of said plates, said tire having its inner periphery formed with transverse radially disposed lug portions complementary to and engaging in the grooves in said ange portions, said tire having a flat cylindrical surface on the peripheral edge thereof, a backing member in the form of a exible ring mounted on said surface and an abrasive band held to the exterior of said backing member. ARTHUR WILLIAM MALL. 

